won his opening-round match 7-6, 6-4 over Ohio State qualifier Peter Kobelt at the Tevlin Family Futures on Tuesday in Toronto, Canada.
Sandgren, the No. 7 seed, plays Filip Peliwo in Wednesday's second round.
Rhyne Williams faces another Ohio State standout in Chase Buchanan. In their lone collegiate meeting, Williams beat Buchanan 6-1, 7-6 (6) in the second round of the ITA All-American Championships last November.
In tonight's doubles match, Sandgren and Williams face Marvin Rolle of the Bahamas and Oliver Sajous of Haiti.